20430743 has 4 divisors (see below), whose sum is σ = 20689440. Its totient is φ = 20172048.

The previous prime is 20430727. The next prime is 20430749. The reversal of 20430743 is 34703402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20430743 - 2⁴ = 20430727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129230 + ... + 129387.

It is an arithmetic number, because the mean of its divisors is an integer number (5172360).

Almost surely, 2^20430743 is an apocalyptic number.

20430743 is a deficient number, since it is larger than the sum of its proper divisors (258697).

20430743 is an equidigital number, since it uses as much as digits as its factorization.

20430743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258696.

The product of its (nonzero) digits is 2016, while the sum is 23.

The square root of 20430743 is about 4520.0379423186. The cubic root of 20430743 is about 273.3766308898.

The spelling of 20430743 in words is "twenty million, four hundred thirty thousand, seven hundred forty-three".